William crandell



Warten tetra stent e Letters Patent No. 80,061, dated July 21, 1868.

IMPROVEMENT IN SHAFT-COUPLING.

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T0 ALL WHOM IT MAY CONCERN:

Y Be it known `that I, WILLIAM CRANDELL, of Philadelphia, Pennsylvania,have invented an Improved Shaft- -Couplingg and I do hereby declare thefollowing to be :i full, clear, and exact description ofjtheV same.` Myinvention consists- Y i First, of a coupling, composed of-two halves,connected together on one side ofthe shaft by bars, or theirequivalents, and at'the opposite side ofthe shaft by screws or bolts, as'described hereafter.

Second, in arranging the said bars, or their equivalent, nearer to theshaft than thej screws orbolt's, so

that the exertion of a comparatively slight force to tighten thebolts,'will insure the tightes'tgriping of the v shafts by the,coupling.

Third, in embedding the bars in the coupling during the p rocess ofcasting the same, as described hereafter. Fourth, in a.' certainapplication-cf setscrews, described hereafter, for preventing theendplay o f theshafts. -In order to enable others skilled in the arttomake and use my invention, I will new proceed to `describe itsconstruction and operation, reference being had to the accompanyingdrat'ving,A whichnfcrms apart of this specification, and in which-Figure 1 is a'transverse section ofthe coupling as'v it appearsimmediately after being cast. Figure'2, the same ofthe coupling whenfinished.. Figure 3, a longitudinal section on the line 1-2,'g. ZFigures 4 and 5, transverse sections of modifications of' the coupling.v Although the coupling. when l'inished consists of two semi-cylindricalpieces or halves,.A and A', lheld together 'by the wrought-iron bars Band D and screws D and D', referred to hereafter, the two pieces areAunited in casting ,at'a a, iigfl, and remain Vthus united while thecoupling is being bored out, turned,'and otherwise finished, when the.connections an are cut a\vnyt he only 'remaining connecting media beingtheisaid bars and screws.' Y v v The bars B and B are of good toughwrought iron,.enlargcd nt thc opposite ends, andere ,introducedinto Athemoulds, so that when the coupling is cn'st the bars arepermanentlyembcddedin'the'iron.

E and E are the endslof two adjaccntfshafts, eachttting in andprojecting` halt' way through the coupling, f in which is cut a Vgroovefor the reception of-keys or feathers, e e, on the shafts.

The set-'screws D and D pass through the portieri A intof'the portion Aof the coupling,`therc being recesses for the reception ofthe heads ofthe scre\vs,as shown in figer?.

On tightening thesescrcws they have a tendency to draw the lowerportions ofthe two halves of thecoupling together,`.nnd their. tendencyto force apart the upper portions is resisted by the permanent bars Bi`and B 4beneerthe tightening ofthe screws must Vresult i'n`the endsofthe two shafts being rmly griped byand. between the twohnlves. v

The nearer the permanent bars are to the centre ofthe shaft, and thefurther away th'escre-Ws are from the latter, the greater will he'theleverage exerted to gripe thesliafts; hence itwill be seen, onlreference to fig. '2, that the bars are nearer to the shaft than'thescrews. I

The advantages ot' this feature, however,will be most apparent onreferring to fig. 4, which represents my improved coupling made oflarger diameter, and casthollow for the sake of lightness.

In this case the screws D and D are twice as far from the centre ci' thesha-ft as the permanent couplingbars.,Y so that a comparatively slightforce exercised in tightening the screws will insure the connement ofthe shafts by the coupling with the tiglitest gripe.

In that class of couplings, which are known as clam`p-couplings howevertight the shafts may be griped, they have a tendency at times to-workendwnys. I norder to prevent this, I` useset-scrcws, F, applied to thecoupling, as shown in figs. 2 and 4, the point ot' one screw penetratinga recessin one shaft, and that of the other screw a recess in the othershaft', and these screws eifectually prevent any cn'd'play of theshafts.'

I claiml as my invention, 'and desire to secure by Letters Patentn I 1.A coupling, composed of two halves, connected together on one side oftheshaft by bars or link-s B and B', or their equivalents, a'nd on theopposite side of the shaft by set-screws or bolts, all ysubstantially as,set-forth*r 2. Arranging the said bars or links, or their'equivalentsfnearer to the shaft than the said. screws orbol'ts, as andfor the purpose set forth. 4 3. The bars B and B', embedded in thecoupling during the process of casting the same, as specified. 4. Incombination with s griping-copling, set-screws F, appliedv 'to preventthe end .play of the shfts, as set forth. l l

In testirlny whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

I I v WM. CRANDELL.

Witnesses z J. P. DELANEY, WM. A. STEEL.

